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Fair Value of Financial Instruments - Carrying Value and Fair Value Estimate of Current and Long Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 28, 2017
Jun. 29, 2017
Sep. 29, 2016
Fair Value Disclosures [Abstract]      
Carrying value of long-term debt: $ 27,943 $ 28,808 $ 31,393
Fair value of long-term debt: $ 28,355 $ 29,316 $ 32,657